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INDONESIA
Journal of Geosciences and Applied Geology
Published by Universitas Padjadjaran
ISSN : 25793136     EISSN : 25793136     DOI : https://doi.org/10.24198/gsag.v7i3
Core Subject : Science, Engineering,
Earth & Planetary Sciences Engineering
Journal of Geological Sciences and Applied Geology (GSAG) is a National multidisiplinary Journal focus on Geological Sciences, Applied Geology, and Geological Engineering and Earth Science. Our Mission is to publish research related to (but not limited) Geology Petrology Paleontology Stratigraphy Sedimentology Remote Sensing Geomorphology GIS Engineering Geology Geotechnics Geochemistry Geophysics Geological Hazard and Disaster Geopark Hazard Mitigation Geography Earth Sciences
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 117 Documents
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Potential Collapse Based on Discontinuity Plane In The Andesite Quary Of Mount Geulis, Jatinangor District, Sumedang Regency, West Java Mochamad Muslim Taufiq; Raden Irvan Sophian; Nur Khoirullah; Zulfialdi Zakaria
Journal of Geological Sciences and Applied Geology Vol 5, No 2 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v5i2.34878

Abstract

Landslide are natural disasters that often occur in West Java, in 2020 landslides have occurred 852 times. In an effort to prevent the occurrence of rock landslides, it is necessary to study the stability of rock slopes, so it is necessary to evaluate the discontinuity of the rock and take engineering geological. The purpose of this study is to analyze the stability of rock slopes in the study area so that the types of landslides that can occur can be known. Method used is Kinematic Analysis where the object of research is an andesite outcrop located at the northwest foot of Mount Geulis, Cinanjung Village, Jatinangor District. Kinematic analysis is an analysis of the movement of objects without considering the forces that cause them. Various types of slope failure are associated with geological structures that result in a discontinuity plane in the rock body. The results of the study are in the form of determining the potential for landslides that can occur in the research area. Based on the kinematic analysis of the types of failure in the research area that can occur are wedge types in the MT-2, MT-5, and MT-6 segments and toppling types in the MT-3, MT-4, MT-7 segments and Planar failure found in the MT - 1 segment. potential failure in the study area are toppling and wedge with percentage values for the possibility of landslides were obtained, namely: wedge failure is 1.82% - 3.91% and toppling failure is 21.82% - 38.95% and Planar failure is 55.81%
STRUCTURAL GEOLOGY AND MAGMATISM/VOLCANISM ACTIVITY TOWARD GEOMORPHOLOGY IN BANDUNG BARAT-CIRANJANG, WEST JAVA Iyan Haryanto; Nisa Nurul Ilmi; Johanes Hutabarat; Nanda Natasia; Edy Sunardi
Journal of Geological Sciences and Applied Geology Vol 3, No 3 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i3.25947

Abstract

Geomorphology along Ciranjang to Bandung Barat is dominated by structural hills while others are related to the magmatism/ volcanism activity. The others morphological features are plain land which belong to Ciranjang and Bandung depression. In interpreting geological structures, topography map and DEM were used together with field data particularly the landscape faulting indication and flow pattern. The compiled data of morphology, stratigraphy and landscape in the study area showed that the geomorphology of the area could be differ into several unit which are structural hill, non-structural hill, and plain morphology units. Sedimentary structural hill unit were develop in Rajamandala hills starting from the Cianjur-Bandung border, Solitary hills geomorphological unit developed in Cililin area, and the developed plain unit developed in Ciranjang and Cililin area
MOUNTAIN-FRONT SINUOSITY AND ASYMMETRICAL FACTOR OF LELES-GARUT INTRA-ARC BASIN, WEST JAVA Iyan Haryanto; Djadjang Jedi Setiadi; Syaiful Alam; Nisa Nurul Ilmi; Edy Sunardi
Journal of Geological Sciences and Applied Geology Vol 2, No 5 (2018): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i5.20230

Abstract

The Leles-Garut Basin, with an elevation ranges between 650 and 725 above mean sea level, is a Quaternary topographic basin area situated in the east-trending volcanic arc of West Java. In contrast to the adjacent Bandung Basin, the nature of the basin bounding area of the Leles-Garut Basin is not clearly defined. The presence of volcanic chain and structural lineament exhibits the difference in morphological features. A quantification of morphological indices was chosen to redefine an active tectonic involvement in surrounding basin border. Mountain-front sinuosity indices range from 1.1 to 3.9 and basin asymmetrical factor suggests a wide range of the effects of active tectonic even a little tilting. The study unveil that the basin bounding is not only volcano-bounded but also fault-bounded.
SMALL BENTHIC FORAMINIFERA AS AN INDICATOR OF PALEOTSUNAMI IN UJUNGKULON, BANTEN PROVINCE, INDONESIA Ria Fitriany; Lia Jurnaliah; T. Y. Waliana Muda Iskandarsyah
Journal of Geological Sciences and Applied Geology Vol 3, No 1 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i1.22241

Abstract

Research area is located at 1050 27” 6,99” E and  60 50’ 1,29” S. The purpose of this research is to know the diversity of small benthic foraminifera on “X” core, Ujung Kulon, Banten Province, Indonesia.  Sixteen sediment samples (paleotsunami deposits) from research area were analyzed to collect small benthic foraminifera. Sediment samples are coastal sediment that were taken from one drill point by using shallow drill to a depth 240cm from the ground. Sampling for analyses small benthic foram was conducted in each layer sediment. At this stage, sequence of layers and the thickness of sediment were observed. In order to separate the sediments and the foraminifera, sediment samples were treated using Hydrogen Peroxide method. Small benthic foraminifera data is collected by using quantitative method. The number of species and individuals were counted in every 1 gram dry sample. Analyses of small benthic foraminifera shows there are 55 species small benthic foraminifera and 43.866 specimen. The dominance species is Planulina wuellerstorfi which is a deep marine species. Furthermore, The Sannon-Wiever diversity index of all sample are low. It can be concluded that was a paleotsunami.  
Hydrostratigraphic Assessment of Groundwater Flow System in Slopes of the Volcanic Mt. Talang, West Sumatera Azwar Satrya Muhammad; Cipta Endyana; . Hendarmawan
Journal of Geological Sciences and Applied Geology Vol 2, No 3 (2017): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i3.15646

Abstract

Mount Talang is one of the active volcanos in Indonesia, it located at Kayu Aro District, Solok Regency, West Sumatera, Indonesia, and Mount Talang is part of Barisan Mountain and lies at Sumami segment which is part of the active Sumatera Fault. In groundwater flow, a fault zone can act as a sink, or as a barrier, when the fault zone highly permeable in relation to the host rock and the fault zone must trend so as to maximize its effects, preferably parallel with general trend of the groundwater flow. Six explorations well identified at the North West Slope of Mount Talang and only two explorations well productive to be converted as exploitation well, while the others dry. Base on the geological setting, the hypothesis is faults play the role for groundwater flow. Fault occurrence analyzed from the lithology of the Bore Log each well by developed 2D hydrostratigraphic model.  Keywords: Groundwater, Hydrostratigraphy, Borehole, Volcanic.
Slope Stability Analysis of East Ring Road Construction at Sadawarna Dam With Shear Strength Reduction Method Rafino Kurnia Putra; Zufialdi Zakaria; Muhammad Kurniawan Alfadli; Raden Irvan Sophian; Nur Khoirullah; Yusi Firmansyah
Journal of Geological Sciences and Applied Geology Vol 7, No 3 (2023): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v7i3.50589

Abstract

Slope stability has been a problem that studied on geotechnical works for the uncertainties such as varieties of soil behaviours to unpredicted failure of measurements and samplings. The Limit Equilibrium Method (LEM) has been popular for decades for its convenience but cannot determine displacement thus the result could be uncertain. As computational calculations have been developed, the Finite Element Method (FEM) began to use as a tool to not only determine factor of safety, but also determine displacement and forces that affect slope’s stability. This research was done to analysed slope stability using Shear Strength Reduction (SSR) and compared it to general method such as Limit Equilibrium Method (LEM). The research was conducted on a section in Sadawarna DAM ring road area, Subang, West Java. Slope on research area was divided into two layers with the bottom layer relatively non-cohesive compared to the top of layer. Both soil however dominantly consist with fine grain soil such as silt and clay. The upper layer of slope can contain more water with liquid limit of 73,46% compared to the lower layer with 68,27% liquid limit.  Simulation result showed slope that analysed using SSR method has Factor of Safety (FoS) 0,12 lower than LEM method. SSR method could be used to analysed pessimistic value at worst scenario and could predicted deformation of slope.
Application of Fault Fracture Density in Determination of Zones with High Permeability Levels on Geothermal Surface Manifestations in the Sukarame Region, Sukabumi Regency, West Java Province Galih Hadisurya Ramadhan; Agus Didit Haryanto; Iyan Haryanto; Mochamad Nur Hadi; Santia Ardi Mustofa
Journal of Geological Sciences and Applied Geology Vol 5, No 1 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v5i1.34902

Abstract

Indonesia is a country with quite large geothermal potential with a volcanic distribution that extends from Sabang to Merauke. The total potential for developing geothermal energy in Indonesia can reach 28,579 MWE if it is developed properly. This study was conducted for determining a permeable zone at the research location which is in Sukarame Village that can be related to the emergence of hot springs as a geothermal surface manifestations, besides that this research can also provide an overview of the general direction of geological structures that may develop in the research area. The method used in this study is Fault fracture density analysis which can determine the zone with a high level of permeability based on the lineament pattern drawn from remote sensing interpretation. The main data source for interpreting lineament pattern analysis is DEMNAS imagery which built from 3 satellites imagery including IFSAR, TERRASAR-X and ALOS PALSAR. The lineament pattern that have been analyzed then processed computationally into rose a diagram to get the general direction of structural geology which may develop. The total length of the lineament pattern is also calculated to obtain the lineament density value that leads to the determination of the permeable zone. The lineament pattern in the research area has a general direction of northeast-southwest, while the lineament density value in the study area has a value range of 4534.714078 – 9084.119758 m/km2. Areas with a high level of permeability coincide with the point of hot springs as a manifestation of the geothermal surface.

Page 12 of 12 | Total Record : 117

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